Super-capacitor-based DC voltage sag suppression device and suppression method thereof

The invention discloses a super-capacitor-based DC voltage sag suppression device and a super-capacitor-based DC voltage sag suppression method thereof, which belong to the technical field of power equipment. The device consists of a super capacitor array (CS), a Buck/Boost type bidirectional power conversion circuit and a contactor (KD). When a voltage sag suppressor is powered on and run, the super capacitor array (CS) is charged by the Buck/Boost type bidirectional power conversion circuit; and when a DC bus has voltage sag due to a failure of an AC system, the super capacitor array (CS) provides energy to realize boosting by the Buck-Boost type bidirectional power conversion circuit to support the voltage of the DC bus. The invention has the characteristics of simple structure, high reliability, low loss, long service life, no maintenance, no environmental pollutions and the like.